NPZ:
npz files are experiment data output and contain the pursuit tracking data. It needs to be converted to .mat using hte provided python script before it can be read into the matlab script for analysis.
task a refers to the execution task data, task d to the imagery task data. 
SXX is the subject ID


EEG, VHDR, VMRK:
eeg, vhdr and vmrk files are brain vision recorder files and can be read into eeglab using the provided code
task a refers to the execution task data, task d to the imagery task data.
SXX is the subject ID


CSV:
csv file is the result from an online questionnaire participants filled in prior to participating in the lab experiment
is analyzed for the methods section using the provided matlab script